Pencil-sharpener



(No Model.)

m EN E P m H 8 HL M N WE P No. 433,684. Patented Aug. 5, 1890.

UNITED STATES PATENT OFFICE.

WILLIAM II. JONES, OF HARTFORD, CONNECTICUT.

PENClL-SHARPEN ER.

SPECIFICATION forming part of Letters Patent No. 433,684, dated August 5, 1890.

l Applieationfiled January 10, 1890. Serial No. 336,543. (No model.)

To all whom it may concern.-

Be it known that I, WVILLIAM II. JONES, of the city and county of Hartford, in the State of Connecticut, have invented certain new and useful Improvements in Pencil-Sharpeners, which improvements are described in the following specification, and are illustrated by the acompanying drawings.

My invention relates to those pencil-sharpeners which have a conical recess in which theterminal portion of a pencil may be sharpened by rotation.

It is the object of the invention to provide such a pencil-sharpener with a delicatelyadjustable cutter, which is capable of being set in any desired position of advancement toward the pencil, and of being conveniently removed for sharpening or renewal when worn. To accomplish this object, I use an adjustable slotted cutter of peculiar form, and guiding mechanism, which limits the advancement of the cutter to an oblique direction.

The best manner in which I have contcmplated applying the principle of my invention is illustrated in said drawings, in which- Figure 1 is a side view of a pencil-sharp ener which is constructed in accordance with my invention. Fig. 2 is an edge View of the same. Fig. 3 is a reverse edge view of the same, with parts broken away to show construction. Fig. 4 is a cross-section on line so a: of Fig. 1.

In the views the numeral 1 denotes a metallic thimble, which constitutes the body of the sharpener. This thimble has a conical bore extending from end to end, and is provided with a terminal ring or finger piece 2. One side of the thimble is cut by a slot 3, which opens the bore from end to end, excepting only a short distance at the larger end of the thimble, where the latter is re-en forced by a circumferential flange l. Adjacent to slot 3 is a wing which projects from thimble 1 and is flattened on one side to form a seat 5 for the cutter, which is hereinafter described. At the outer edge of seat 5 is a straight flange 6, which serves as a guide for the cutter 9.' The latter is a flat steel blade having two straight edgesnamely, the cutting-edge 7 and the back edge 8- which form with each other an angle equal to that formed between the face of guide 6 and the longitudinal axis of slot 3. Edge 7, being ground sharp for cutting, reaches through slot 8, while edge 8 backs against guide ('5. A In the middle of cutter 9, and parallel with edge 8, is a slot 10, occupied by a set-screw 11, which takes into wing 5 and holds the cutter ad j ustably to its seat.

Such being the construction of this instrument, its mode of operation requires little description. Cutter 9 is obviously capable of easy removal for the purposes of grinding or renewal. The greater or less advancement of the cutting-edge 7 into or through slot 3 is determined and regulated by the adjustment of cutter 9 upon seat 5. This is effected by loosening screw ll and by moving the cutter in the direction of the length of slot 10. In the process of adjusting the cutter its edge 8 slides along flange 6, and the cutting -'edge 7 advances uniformly and obliquely into the path of the pencil. The cutting-edge is thus capable of very delicate adjustment, which is not disturbed by the use of the sharpener for the reason that the cutter firmly abuts against flange 6. It is also to be observed that the extremity of the pencil is exposed to the action of the cutter after emerging from the thimble. Accordingly, it.- is practicable by the use of this instrument to sharpen a lead-pencil including the lead without twisting off or breaking the latter.

Such being the construction and operation of my invention, I claim- 1. In a pencil-sharpener, a slotted thimble, which is providedwith a seat and guidingflange for a cutting-plate, in combination with a slotted cutting-plate whose cutting-edge and back edge are at an angle with each other, and a set-screw occupying the slot of the cutting-plate and holding said plate adjustably to said seat and flange, substantially as and for the purpose specified.

2. In a pencil-sharpener, a slotted thimble, which is provided with a terminal fingerpiece and with a flanged cutter-seat, in combination with a slotted cutting-plate whose back and front edges are at an angle with each other, and a set-screw holding said cutting-plate adj ustably to its seat, substantially as and for the purpose specified.

In testimony whereof I have hereunto set my name in the presence of two witnesses.

, IVILLIAM H. JONES. l/Vitnesses:

WILLARD EDDY, SUsIE L. HAYWARD. 

